Oceanographic conditions in the southern bay of Bengal from ~0.8 - 1.3ma
IODP Expedition 354 drilled an east-west transect of 7 cores in the southern Bay of Bengal that are well situated for better understanding the link between the tropical Indian Ocean and the northern Bay of Bengal. We focus on IODP site U1452 (8 ??N, 87??E; 3670m water depth), where we reconstructed...
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San Francisco State University
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ftcalifstateuniv:oai:dspace.calstate.edu:10211.3/213684 2023-05-15T18:00:58+02:00 Oceanographic conditions in the southern bay of Bengal from ~0.8 - 1.3ma Lagos, Alexandria Desirae Earth & Climate Sciences 2019 http://hdl.handle.net/10211.3/213684 en_US eng San Francisco State University http://hdl.handle.net/10211.3/213684 Copyright by Alexandria Desirae Lagos, 2019 AS36 2019 ERTH .L34 Thesis 2019 ftcalifstateuniv 2022-04-13T11:45:02Z IODP Expedition 354 drilled an east-west transect of 7 cores in the southern Bay of Bengal that are well situated for better understanding the link between the tropical Indian Ocean and the northern Bay of Bengal. We focus on IODP site U1452 (8 ??N, 87??E; 3670m water depth), where we reconstructed Mid-Pleistocene (0.84 - 1.27Ma) oceanographic conditions using the Mg/Ca and 8180 of the planktonic foraminifera, Globigerinoides Sacculifer, and the 8180 and 8 13C of the benthic foraminifera, Uvigerina peregrina. We used G. Sacculifer Mg/Ca to generate a sea surface temperature (SST) record ranging from 26.9 - 31.2??C during the Mid-Pleistocene. The mean SST remains stable at 28.9??C and has no long-term temperature trend from 0.84 - 1.27Ma. The 8180 of G. sacculifer calcite and SST records were used to estimate the 8180 of seawater (Bemis et al., 1998), which ranges from 0.7 - 2.2%o. The benthic U. peregrina 8180 record ranges from 3.2 - 4.7%o, which is consistent with LR04 benthic 8180 stack (3.2 - 4.7%o; Liseicki & Raymo, 2005). While the U. peregrina 8180 record captures the glacial cycles, the timing is offset from the LR04 stack, suggesting further fine-tuning of the IODP site U1452 age model may be needed. The benthic 8 13C record ranges from -1.9 to -0.9%o, with a ~0.3%o decrease in amplitude through the Mid-Pleistocene, a trend consistent with other deep-ocean 8 13C records. Thesis Planktonic foraminifera California State University (CSU): DSpace Indian |
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Open Polar |
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California State University (CSU): DSpace |
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ftcalifstateuniv |
language |
English |
description |
IODP Expedition 354 drilled an east-west transect of 7 cores in the southern Bay of Bengal that are well situated for better understanding the link between the tropical Indian Ocean and the northern Bay of Bengal. We focus on IODP site U1452 (8 ??N, 87??E; 3670m water depth), where we reconstructed Mid-Pleistocene (0.84 - 1.27Ma) oceanographic conditions using the Mg/Ca and 8180 of the planktonic foraminifera, Globigerinoides Sacculifer, and the 8180 and 8 13C of the benthic foraminifera, Uvigerina peregrina. We used G. Sacculifer Mg/Ca to generate a sea surface temperature (SST) record ranging from 26.9 - 31.2??C during the Mid-Pleistocene. The mean SST remains stable at 28.9??C and has no long-term temperature trend from 0.84 - 1.27Ma. The 8180 of G. sacculifer calcite and SST records were used to estimate the 8180 of seawater (Bemis et al., 1998), which ranges from 0.7 - 2.2%o. The benthic U. peregrina 8180 record ranges from 3.2 - 4.7%o, which is consistent with LR04 benthic 8180 stack (3.2 - 4.7%o; Liseicki & Raymo, 2005). While the U. peregrina 8180 record captures the glacial cycles, the timing is offset from the LR04 stack, suggesting further fine-tuning of the IODP site U1452 age model may be needed. The benthic 8 13C record ranges from -1.9 to -0.9%o, with a ~0.3%o decrease in amplitude through the Mid-Pleistocene, a trend consistent with other deep-ocean 8 13C records. |
author2 |
Earth & Climate Sciences |
format |
Thesis |
author |
Lagos, Alexandria Desirae |
spellingShingle |
Lagos, Alexandria Desirae Oceanographic conditions in the southern bay of Bengal from ~0.8 - 1.3ma |
author_facet |
Lagos, Alexandria Desirae |
author_sort |
Lagos, Alexandria Desirae |
title |
Oceanographic conditions in the southern bay of Bengal from ~0.8 - 1.3ma |
title_short |
Oceanographic conditions in the southern bay of Bengal from ~0.8 - 1.3ma |
title_full |
Oceanographic conditions in the southern bay of Bengal from ~0.8 - 1.3ma |
title_fullStr |
Oceanographic conditions in the southern bay of Bengal from ~0.8 - 1.3ma |
title_full_unstemmed |
Oceanographic conditions in the southern bay of Bengal from ~0.8 - 1.3ma |
title_sort |
oceanographic conditions in the southern bay of bengal from ~0.8 - 1.3ma |
publisher |
San Francisco State University |
publishDate |
2019 |
url |
http://hdl.handle.net/10211.3/213684 |
geographic |
Indian |
geographic_facet |
Indian |
genre |
Planktonic foraminifera |
genre_facet |
Planktonic foraminifera |
op_source |
AS36 2019 ERTH .L34 |
op_relation |
http://hdl.handle.net/10211.3/213684 |
op_rights |
Copyright by Alexandria Desirae Lagos, 2019 |
_version_ |
1766170262853648384 |